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Michael Mann's hockey stick - misleading the world (Read 6531 times)
longweekend58
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Re: Michael Mann's hockey stick - misleading the world
Reply #30 - Sep 25th, 2013 at 9:45am
 
muso wrote on Sep 21st, 2013 at 12:33pm:
I just checked out three at random. Vinther et al 2010 It was about temperatures in Greenland - a highly localised study. It doesn't negate anything in the other 14 studies.  Cook et al 2009 was about the 1930s dustbowl in the US. Totally irrelevant. Grinsted et al 2006 - The Medieval Warm Period in Svalbard, Norway - another highly regionalised study.

Australian temperatures over the last 1000 years:
http://www.realclimate.org/images//GergisFigure4-1024x461.jpg

It wasn't a global phenomenon.

http://www.newscientist.com/article/dn16892-natural-mechanism-for-medieval-warmi...
Quote:
Warm blast

This pressure difference in turn revealed that the medieval period must have experienced a strongly positive North Atlantic Oscillation (NAO) – the ocean current that drives winds from the Atlantic over Europe. The more positive the NAO is, the more warm air is blown towards the continent.

The idea to use growth rings to work out past climate change is not new, but Trouet's team is the first to look back beyond 1400 in the European record. They found that the strongly positive NAO lasted for about 350 years from 1050 to 1400.

By combining their data with information from other regions of the world during medieval times and plugging it into different models, the researchers have also come up with a hypothesis of what made the warm winds so persistent.

"It turns out that in the tropical Pacific, the El Niño system was in a negative La Niña mode, meaning it was colder than normal," says Trouet.



Ive heard this explanation before that the MWP was just a regional event.  I find that the most ridiculous claim I've heard in years.  You expect people to believe that for a 300 year period temperatures were several degrees warmer but only in a few select locations but not others?  apart from the highly unlikely hood of such a  scenario don't you find it peculiar that the places that apparently DIDNT have the MVP are all places that don't have recorded history and all the places that DO have the MVP have extensive historical recording of this event?  ditto for the little ice age.

it is an absurdity to believe this highly convenient explanation which has no proof.  And remember, the first explanation for the absence of the MWP was that it was a MYTH and that the MWP never occurred at all.  It was only after the massive evidence supporting both MWP and little ice age were thrown at then did they concede but then claim that it was only local.

The Hockey Stick long ago ceased being merely bad science and has moved clearly into the fraud category.
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longweekend58
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Re: Michael Mann's hockey stick - misleading the world
Reply #31 - Sep 25th, 2013 at 9:53am
 
muso wrote on Sep 22nd, 2013 at 8:21am:
The Medieval Warm period is irrelevant anyway. The mechanism for the regional warming have been explained. Nobody in their right minds would claim that every single  independent paleotemperature study has been doctored in some way.

Esper et al 2012
- The study estimated temperatures going back 2,000 years by analyzing the density of tree rings taken only from northern Finland and Sweden.  The record they produced only reflects temperatures between June and August.

This paper was misreported on Fox news. The research team repudiated the claims as follows :
Quote:
Our paper is for northern Scandinavian summer temperatures, so extrapolating to large scale annual temperatures is not really correct



you should really read the studies on the tree ring data used by Mann.  he uses large amounts of trees that have been concluslively shown to have no temperature correlation.  He has actually MADE UP some data and inverted others.  Tree ring data is extremely controversial and his statistical studies into correlation actually show that temperature and tree ring data has a very very low correlation ie statistically non-existent.
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Re: Michael Mann's hockey stick - misleading the world
Reply #32 - Sep 25th, 2013 at 10:22am
 
longweekend58 wrote on Sep 25th, 2013 at 9:53am:
muso wrote on Sep 22nd, 2013 at 8:21am:
The Medieval Warm period is irrelevant anyway. The mechanism for the regional warming have been explained. Nobody in their right minds would claim that every single  independent paleotemperature study has been doctored in some way.

Esper et al 2012
- The study estimated temperatures going back 2,000 years by analyzing the density of tree rings taken only from northern Finland and Sweden.  The record they produced only reflects temperatures between June and August.

This paper was misreported on Fox news. The research team repudiated the claims as follows :
Quote:
Our paper is for northern Scandinavian summer temperatures, so extrapolating to large scale annual temperatures is not really correct

Tree ring data is extremely controversial and his statistical studies into correlation actually show that temperature and tree ring data has a very very low correlation ie statistically non-existent.


So do you think those studies can be discounted? There are plenty of better proxies, such as lacustrine varve studies.
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longweekend58
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Re: Michael Mann's hockey stick - misleading the world
Reply #33 - Sep 25th, 2013 at 4:58pm
 
muso wrote on Sep 25th, 2013 at 10:22am:
longweekend58 wrote on Sep 25th, 2013 at 9:53am:
muso wrote on Sep 22nd, 2013 at 8:21am:
The Medieval Warm period is irrelevant anyway. The mechanism for the regional warming have been explained. Nobody in their right minds would claim that every single  independent paleotemperature study has been doctored in some way.

Esper et al 2012
- The study estimated temperatures going back 2,000 years by analyzing the density of tree rings taken only from northern Finland and Sweden.  The record they produced only reflects temperatures between June and August.

This paper was misreported on Fox news. The research team repudiated the claims as follows :
Quote:
Our paper is for northern Scandinavian summer temperatures, so extrapolating to large scale annual temperatures is not really correct

Tree ring data is extremely controversial and his statistical studies into correlation actually show that temperature and tree ring data has a very very low correlation ie statistically non-existent.


So do you think those studies can be discounted? There are plenty of better proxies, such as lacustrine varve studies.



a better question is why you don't join the chorus of condemnation of the hockey stick graph which is fraudulent.  If you believe you have better sources of proof of your hypothesis then go ahead and condemn it.  it is APPALLING science and the fact that it has been accepted and continues to be so by many is evidence of the 'pre-determine outcome' belief.

I used to think ACC was simply wrong.  Now I see it is more than that.  It is a balief system of which the science is generally very unsupportive.
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Re: Michael Mann's hockey stick - misleading the world
Reply #34 - Sep 25th, 2013 at 7:24pm
 
I can see that the denialist blogosphere is huge, so I'm not surprised that the layman tends to go with the easier to understand arguments.

If you read the story behind Mann's study it becomes apparent that he was up against the establishment of the day, but was still vidicated by at least 16 subsequent independant studies.

You need to read through the account of the whole fiasco to understand this.

Any minor issues in the statistical treatment  had no effect on the final data.

Apart from that, even if there was a global event that was warmer than the temperatures of 1999, it wouldn't be significant, because the underlying cause of the current warming is well established.

Which part do you particularly disagree with?

1. Do you disagree that the increase in CO2 is due to fossil fuel burning, cement production and change of land use?

2. Do you disagree with the fact that carbon dioxide is a greenhouse gas?

3. Do you disagree with the climate sensitivity? In other words, do you believe that the moisture feedback, albino, cloud feedback etc combines  is negative or low?

If you have an honest position on that, I'm sure that you won't mind sharing it with us.
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Re: Michael Mann's hockey stick - misleading the world
Reply #35 - Sep 25th, 2013 at 8:20pm
 
Spare me the crap muso.

If the hockey stick was correct and based on real science the IPCC wouldn't have taken it out of their bullsh!t assessment reports.

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longweekend58
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Re: Michael Mann's hockey stick - misleading the world
Reply #36 - Sep 25th, 2013 at 8:41pm
 
muso wrote on Sep 25th, 2013 at 7:24pm:
I can see that the denialist blogosphere is huge, so I'm not surprised that the layman tends to go with the easier to understand arguments.

If you read the story behind Mann's study it becomes apparent that he was up against the establishment of the day, but was still vidicated by at least 16 subsequent independant studies.

You need to read through the account of the whole fiasco to understand this.

Any minor issues in the statistical treatment  had no effect on the final data.

Apart from that, even if there was a global event that was warmer than the temperatures of 1999, it wouldn't be significant, because the underlying cause of the current warming is well established.

Which part do you particularly disagree with?

1. Do you disagree that the increase in CO2 is due to fossil fuel burning, cement production and change of land use?

2. Do you disagree with the fact that carbon dioxide is a greenhouse gas?

3. Do you disagree with the climate sensitivity? In other words, do you believe that the moisture feedback, albino, cloud feedback etc combines  is negative or low?

If you have an honest position on that, I'm sure that you won't mind sharing it with us.


I have read the entire account and it is quite clear that you have not.  His statistical analysis has been utterly debunked by no less that the worlds leading expert in principal component analysis.  the MWP and little ice age were completely absent despite being proven experiences in history.  the argument that they occurred only regionally is absurd especially when you consider that the regions where they apparently didn't occur all have no recorded history!

Do you realise that Mann's 2000 version hockey stick graph was considered to be so bad that one of his previous major supporters and climate scientist researcher wanted his name taken off the report because it was so appalling?  Most of the supposed 'supporting reconstructions' used the same data and the same methodolology??  where is the surprise that they came to the same wrong answer?

Do you know that, contrary to government rules and established research doctrine, that Mann refused (and still refuses) to release his data or his methodology and it has all had to be reverse-engineered and in some cases obtained via sideways means?  Do you know that one of Manns sidekiicks actually proudly admitted to a senate enquiry that 'cherry-picking of data' was an acceptable scientific method?

But I ask you again to explain why the MWP and Little Ice age - which are indisputable events - do not appear on his graph?  If you can believe that conveniently inhabited parts of the world could be hotter for 300 years but the rest of the uninhabited/primitive worlds was not then frankly, you will believe anything.  That is quite simply, not credible.  But it is at least consistent with the IPCC claim that their climate models were 100% accurate... as long as you take out all the stuff we didn't know, couldn't predict or got wrong.
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Re: Michael Mann's hockey stick - misleading the world
Reply #37 - Sep 25th, 2013 at 8:47pm
 


Mann’s ‘hockey stick’ claims of the MWP and LIA being local were refuted years before it was published

http://wattsupwiththat.com/2012/06/17/manns-hockey-stick-refuted-10-years-before...
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Re: Michael Mann's hockey stick - misleading the world
Reply #38 - Sep 25th, 2013 at 8:51pm
 
That's Anthony Watt's account of events.
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Re: Michael Mann's hockey stick - misleading the world
Reply #39 - Sep 25th, 2013 at 8:56pm
 
muso wrote on Sep 25th, 2013 at 8:51pm:
That's Anthony Watt's account of events.


No its not, have a read, its scientists and their data that he's bringing to the fore.......??????

You make it sound as though its Anthony's opinion, NO its not its scientific papers by scientists.
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Re: Michael Mann's hockey stick - misleading the world
Reply #40 - Sep 25th, 2013 at 8:59pm
 
longweekend58 wrote on Sep 25th, 2013 at 8:41pm:
But I ask you again to explain why the MWP and Little Ice age - which are indisputable events - do not appear on his graph?  If you can believe that conveniently inhabited parts of the world could be hotter for 300 years but the rest of the uninhabited/primitive worlds was not then frankly, you will believe anything.  That is quite simply, not credible.  But it is at least consistent with the IPCC claim that their climate models were 100% accurate... as long as you take out all the stuff we didn't know, couldn't predict or got wrong.



You really think that the highlighted part is relevant, don't you. Why is it in the slightest bit relevant when similar temperature proxies were used in all studies, not just in Europe. Anecdotal evidence is totally irrelevant.

There was no technology anywhere during this period for the accurate measurement of temperature. Are you claiming that during the medieval period, that the Vikings were more advanced than the Arabs or the Chinese?

Your argument borders on the ridiculous.
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Re: Michael Mann's hockey stick - misleading the world
Reply #41 - Sep 26th, 2013 at 11:29am
 
muso wrote on Sep 25th, 2013 at 8:59pm:
longweekend58 wrote on Sep 25th, 2013 at 8:41pm:
But I ask you again to explain why the MWP and Little Ice age - which are indisputable events - do not appear on his graph?  If you can believe that conveniently inhabited parts of the world could be hotter for 300 years but the rest of the uninhabited/primitive worlds was not then frankly, you will believe anything.  That is quite simply, not credible.  But it is at least consistent with the IPCC claim that their climate models were 100% accurate... as long as you take out all the stuff we didn't know, couldn't predict or got wrong.



You really think that the highlighted part is relevant, don't you. Why is it in the slightest bit relevant when similar temperature proxies were used in all studies, not just in Europe. Anecdotal evidence is totally irrelevant.

There was no technology anywhere during this period for the accurate measurement of temperature. Are you claiming that during the medieval period, that the Vikings were more advanced than the Arabs or the Chinese?

Your argument borders on the ridiculous.


The Vikings sailed NORTH of Greenland which is currently ice-covered.  Northern Greenland cemeteries are located in what is now perma-frost.  that kind of evidence demands a verdict.

NOw the little ice age - also denied by Mann...  during the American civil ware troops dragged artillery pieces over frozen rivers that now barely freeze over at all and then only a couple inches.    The Little Ice age is even more provable and global yet Man denies that as well.  I find that curious.
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Re: Michael Mann's hockey stick - misleading the world
Reply #42 - Sep 26th, 2013 at 11:45am
 
longweekend58 wrote on Sep 26th, 2013 at 11:29am:
The Vikings sailed NORTH of Greenland which is currently ice-covered.  Northern Greenland cemeteries are located in what is now perma-frost.  that kind of evidence demands a verdict.


OK, I thought I knew about the Viking settlements in Greenland as I've read all the sagas in Norse. Please provide evidence that they sailed North of Greenland, and evidence of Northern Greenland cemetaries.

I'd love to see what you come up with, especially considering that the Vikings cremated their dead. 
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Re: Michael Mann's hockey stick - misleading the world
Reply #43 - Sep 26th, 2013 at 12:00pm
 
Just admit it muso.......????

You don't know whether your Arthur or Martha......!!!!

That's what happens when you believe in junk science like the IPCC serve up to you......!!!!
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longweekend58
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Re: Michael Mann's hockey stick - misleading the world
Reply #44 - Sep 26th, 2013 at 4:54pm
 
muso wrote on Sep 26th, 2013 at 11:45am:
longweekend58 wrote on Sep 26th, 2013 at 11:29am:
The Vikings sailed NORTH of Greenland which is currently ice-covered.  Northern Greenland cemeteries are located in what is now perma-frost.  that kind of evidence demands a verdict.


OK, I thought I knew about the Viking settlements in Greenland as I've read all the sagas in Norse. Please provide evidence that they sailed North of Greenland, and evidence of Northern Greenland cemetaries.

I'd love to see what you come up with, especially considering that the Vikings cremated their dead. 


it wasn't Vikings burial but locals.
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